Xiaomi Automatic Sense Infrared Induction Water Saving Device $19.79

https://inskerhome.com/products/x…ing-device
When the sensor enters the side sensing area (within a limited distance of 5 cm), the water began to flow out.
The current lasts for three minutes, and the water remains flow out even if the sensory object leaves.
If the sensor enters the side sensing area again during the water flow process, the water can be stopped at any time.